This lecture examines Antonio Sant'Elia's visionary Città Nuova drawings through a detailed visual and architectural analysis. It explores their innovative concepts of vertical urbanism, integrated infrastructure, adaptability, and technological expression, highlighting how these unbuilt proposals anticipated many features of contemporary cities. The lecture also evaluates the lasting influence of Città Nuova on modern urban design while critically reflecting on its limitations and relevance in the context of today's smart and sustainable cities.